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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2fd011340567abad5a16ec8f76fe5d37b0ac2a0289668cc0ed44d9737eb0d06' 
  AND token = '/2VMGknF1zw4/ry+yEsGEsmZfoC3f3UbQ3szXjjO8xE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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