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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ac2f2fe1f3cdd90829bea2ff5480fd5febe61ae7c4f26923949d76de182b7cb' 
  AND token = '9fHVcfJOZPtV34WjzCJLPWv6+sDu57k+3/pxjluAtmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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