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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa0924f8bc439fd6116578cfe1851418afb68048f45497ae49a29944e7e8e7a6' 
  AND token = 'zdDS8fLx2GhB/pJWLnq1x2r94jtW4RzPl55eDbFkx2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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