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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0675e7c855829fc4d1c0ba101b44fd551f6e5e53c61d0e386622586e0f92dce' 
  AND token = 'AiMpqHhSYvOUjsetsdWhAG3t3ZMft/kaqdAnBFFAtqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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