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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6de92878f6a1ff9101fda4b8c4ce6440a578d77d35fdd24818dd823e08e732c4' 
  AND token = 'vLrDzyAMX+xP7Gfx5pT3u3fdLzIH9SJujGX90Qv+2RA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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