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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11bb32d4e69a833bbef33b823b4b8c2a4b0e767218e91317d94be31c5d3b1c10' 
  AND token = 'xOet8hRESoL0SGJaA+zMIy3dDqcqz9rpB3QoxcD+CZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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