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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7099603b4eeec2ab8f84c75e66f1c411bd1b66fd7f33d3cd934183c4d9fcaa9f' 
  AND token = 'gS79LP615mgdCTLIgsYSmXripagOejgJvOBtNVk1q8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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