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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed1dcf3c81ff661cc0ebd3a2868acf9ade13896a12ed3f8556db18bd415510cb' 
  AND token = '6Ud9Q4Ioi502IujL4I2H8NJG+OSf24rboA5JeCFOFTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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