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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98a0c0a2154bdaab2fdfcf50935db9efb658f0f8a388ae50687905d59b7a52d1' 
  AND token = '+EG+xQ4ep7tmV9enBYsy3PMniqk/0jH0m8I9/hsfghE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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