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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c158525e25c66959ab86b391a7bc92031d3b1dbc514fd9047dd22d3e643e16c' 
  AND token = 'Wqr2qM/ylxqATrfk8CPZoyM0A9934ejUJPIF+kP/zWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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