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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '711b57c4b42a703b8b099d62890d1d732f44b0f7f5bbe0b12b3f4961bcddf26c' 
  AND token = 'VmaduAytUMzLN1AY6yUHgoAf9G4Epui1yBUNZ1NP8i4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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