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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90df01f9eba456e7d8d379526df1d135f47b26a82a9fdb2f72e0a80ac1c1d2ca' 
  AND token = 's2lhUbAVU/34p7HPKI0pN9sGokbeeoeGh9o5w4Q3Imo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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