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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '307286314d157a5a7abda47c5de7ff2704890d3bafa7be1c8d322de53ba2542e' 
  AND token = 'eDAXyIHn9PGmmv3gF+8iTfPsm5I//QkZENMMvfvpvOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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