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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e05fc0eb45d3f1e2523490117e1ad75828fb39458911503245117a217513015d' 
  AND token = 'A/ukiDvbbGCMDpq1rc3/FWG8wx/6k7a8mHH7Gl3Vnlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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