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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3dac3035524c4ceee618552a65455bd2c06058a1dc2257fff69d5f941a80bb5' 
  AND token = 'b551HTLn79oe7jJAUujr8k59eJJi4xZW2XMwB+bRWWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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