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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '447a7e827933e4eacbfc5d62d8a85959fc138aa5b0d9c13915aba9ee078dabd1' 
  AND token = 'q9GkgQ05iiYMmI4Y3ff7HnkImifucY8YSP/DUTcu9Xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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