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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9bd092b07f04813eacf7e43c8975723620ae7bc7a1edfeb425b0fb9bd7046ff' 
  AND token = 'jZiINjR5P5dsEE/ZT+nenAudMUdJF3JxSGiC3TF/Bvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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