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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a93d316647dd469b86b009b7b34d9d7368c4a46e286d6793739cd848976752b' 
  AND token = 'i6mVfE+NetyC/XTT1hF4ER7Qykku9bv/KdmZMykV2QA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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