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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cabd6d76058dcdb41eae74cb2096016177de4f0fecc334f3fa8416ef12c93a91' 
  AND token = 'WhxVqpIdG7gGiQEpF9lcjG/d7FcXCQmf19ty9lBHDOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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