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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0dc33435444679a9088f1f4297a12acd1cdf671ac982893444ad93ddaee20d3' 
  AND token = 'By6HMjNj+Vq5afmKJSevWflpSEl2KQbclYPgm2YHyCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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