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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '799efe34febd65f4497d7fbc578cc23fae6da2d87fa3425be1073e73ff5f4db6' 
  AND token = '7yziDKkr2zqD4XoNDELS7Gl6D54W19gX9i02HLAiIDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00221

JSON explain

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