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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a3b2745476e4202e1863d07d3156e6a617097754889588ba31c6001d44bd588' 
  AND token = 'uKrdWZNWuTpmjZcsRTMzRrKuPwiesgkQKjr7pRl/a6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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