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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07fe550810ae1a6609dcc3cd3fcc601ac1daaac867ca4db9dd8027641af9dcdd' 
  AND token = '+fafb8hAWRK1sy2lp8wilECbajNytwYYFB465Bc2SPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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