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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '464ea107963fc31ec54f4a35bbc0732d0b2284217610a9fe5e184e357facc308' 
  AND token = 'gsZJ4jtRJEfdihwIe7/S82z/IoSAk5EwfXz4+2h/X6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}