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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d4e87bf79e93eac40da54e0976cd71f4c884c54888238518fd4935d89fef310' 
  AND token = 'hNHgMFCNNHobHGLz/ZP0eRsw5p0LW9bDOidU50UlwVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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