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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb5b58dda1b64ea3d428c85db3e4fc15fbc5791798adace05d795718e05d5153' 
  AND token = '0v1Y7+dL15lRtTYQ5e4v6Cv9VaBvJ0uakWrgMA3JEdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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