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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2a145cf6f35c616b2bb2001b0b7423fc1f259ee211d0b250cef091b274b4c49' 
  AND token = 'VMeFEf7wpvMlH4eWHzsouwmr6L/3fHN0t0kYInBtWWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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