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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd70e56e57af61749c54cd0e826be6ec89f29fb3fc179c1ec0315e2e4fb6c053a' 
  AND token = 'DD3/qS6QKaQu6gwC87l0uNcHm+w4fKNczKjTpANTS6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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