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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01fac50662ee4a677461bd6d019a6330ce9251025fbbbc1ba0ffefc4a37e766d' 
  AND token = 'SLmdLO2L4CHHv+xudrpe585ePmgg2c4t+ufsEc3h1U4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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