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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4823af6dfe00a7f03895e1860fc97e56051ce6d59960e1261e650c05e3761af4' 
  AND token = 'WoqNRCktAo/BHgwgVVRXNRexWGrN4pQ5p8N+xKvoSis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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