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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd68a1e9ae5df09f9cf20ef1a80e876da1e90085a2aa3611ca07bd189a76383a' 
  AND token = 'b93+93M2E/coUi3j2Q+B/ahuXoaAAFT5velhfu/3hJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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