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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9b68af2712be6f26edc1f06c95ad4d7d5f46865a3a02df85bf977324da4d3ef' 
  AND token = 'mOfKPV8LmT0gFgDM5MvQQzIRirbtP6SfHDphF8cPe0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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