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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5177b623b74b4342b8e5afe702f98fecf7d4e997623a5cb1b0ba96fdd75e213' 
  AND token = 'djpPWaRu2dFE7beM8trnRFWEMgqlOniLyx9xSrIMv+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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