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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b14c59f2d9177a5a1a010725a83c87cf2c6ea1a4462ef5bce3fc87e1a8ba16b' 
  AND token = 'vcmco7ymDDnw96dvvj02FbFPb2V/ioovHD2td0niaYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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