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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60f080355a4dc002ba33ad0b2c86515f51bb1e1009298e7bdff0c7b58e614b93' 
  AND token = 'G3hhJT0WrjXgB0Oqto4W57ZxI6YVgfhO5GF01ZC4W+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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