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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37bae17c377664e869cdb964de6d0e0ec669cf62d07aa82b2178ca352c535e70' 
  AND token = 'vG1gGUoEfLox/QboB/Q84yGc+SUyroM5LITRP+kKC3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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