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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cff13bec84f55d8aa10b22fe2d4a31b72687547881571cc38cb73fc11259ee47' 
  AND token = '7tsVYr2kemxCS1DYo6ccK30Ig6OHY+x5EPyjJa+ty14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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