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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4481d9777c7f0a56282d3609575b7f0a12deb31633c7ebdbb7aa8b1d2b8eda5' 
  AND token = 'OH+OMK58PELzu+uxFtzxypc0zM4oeyHfQviRqKB13F4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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