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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '902c721741779b641617b1e5b04dd3ffd4fc1ed478f5d16f0e2e6ec51ded2f1d' 
  AND token = 'XmNS1c23CyGKUFkEwT8x15yvmi2bAYsMo0u7WBqbdos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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