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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e31f2a518aa7b29ea09b765fe04a2cedacfb147b130fe38b1b8ae4c4f3fa9cb6' 
  AND token = '+5i3PudvhefM3TERumcn+nDfxYYcJ+T0dBq6GeDHJhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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