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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7710444a54e356ba770686ffa9abfd4cc9e9ff287069c558e9f223cd0b4f6c94' 
  AND token = 'RmQZDftWJIDQlPB1qaZiK0KEPuNh2LM3fYNCCqpCoC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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