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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d2fbc6e70bd17effacec9d7715692afd52b7f516cdd5571a722dbba74d148eb' 
  AND token = 'Iiw+L2rI1HB1ooKdRbdcXDwF4qMJ0ySOKYMyx5fqvoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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