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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ae1c99c1f0093bd8e57ec73c257d9f5ba4c2c13f9289e59f5f200f168362aa9' 
  AND token = 'MxzKjTMS6Jx9eVJERQejTo0ShcvJNcvLgqA3pvpXh+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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