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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5870219d68226f51926ca531790c78c346334635dc17e2255535b4a567988d3d' 
  AND token = 'u9RgwiYE5fS02Dxj2wk96HJR2NMcrkvilfU+h1uVp00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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