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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4110082cc4900c5a606366af9759835a5555445890ae88c0c55ca4d20006bc2b' 
  AND token = '+1zhKHuokwsMSxLFI4e98nS4Ijs76vLuHLfW3aR6nkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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