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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '156c15786fa2d6f0dfd903f6bbb16d46dbda30de8df08fb582b014e3dd982ee8' 
  AND token = 'rnzk5VgwGPobXSHCrHTHaGV6E/AnO3vk8eJ396ju7Zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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