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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1191fd01335b4924683a015e3b45314955202d1cb756658719d11feb40d6d91c' 
  AND token = '2CtzzOiW3OLiZSr+4Aw1Fq+Jm4gO5qryZ45wBKSUsJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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