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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaf1af5325300e793ba388dd30b709a05e3d104ec0c32c177ebf535280396e8c' 
  AND token = '0Fx8U30DKezD0dlQaaDMKAMm/F8+aL7o0IPa+itvsJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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