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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8c9de60e5720d11dfc4e643863ba82d3ebf4d4d8bedad4c4dd62bba7e5364f3' 
  AND token = 'KR7i4jz2RU3Yv+Ms688fMXldbM7UBYAbFipm6pOdixM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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