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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3a116214165d5274c0b5d8c7fe22961e12146e84e3122e4931eae3b7b8de48c' 
  AND token = '/J9mHvyGiSROAt2FXbku0ZhoqfY2oyT3xYWm/tHM0Zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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