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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a580947500ea1b5f9afd689b3a6b3a94cb5d9cbc3b9a960e02dad81798b87895' 
  AND token = '8f+/daIj1rkd+Pjd2LzfZcMcoGQinbkqObCaaKLlS9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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