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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa3c75eac7c6c12f7e3dd636848b1c49a136a361456824cef05d467426f0dc6c' 
  AND token = '9YdtLJhwJeAFLf/C1c4SKNfqH176AhOqQY70lp313EM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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