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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96b5d65a8ad8adcc31e17b5fe0516347cbe57208154c716eb486828a10799f59' 
  AND token = 'TGqcAbvs+9381R+OlDXI4mF+5Vqhr2Qsa50vuQ18COM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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