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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd06a5bb63cdf319476d75779a77599ef0b32c84ca5c3d91cc6f1766d7fbdd6d0' 
  AND token = 'GwKmxl/SFNo+5cF8ZHSNwkWuVSpgu/ybgW2L6bB3rog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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