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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85423b9b679c1891706bd36cdf67f0518dfe56732cfba7f393ec98375f97025e' 
  AND token = 'yMG7xmsCxtL9iv0QtGqQs//wT7uFQPZmdaeSEOvg7Bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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