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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47985120bb8a983590126d57fd488a256477caa404289475604365e2cecb0f31' 
  AND token = 'n3554PW1W0VUXcLuiRe9k/pRFYCU+BZFadScerMRK10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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