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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f64e8530078a179c88bdafc4c23cf503c5869d46a293cf4424f8f93aa2d46afd' 
  AND token = 'BjwVTqUUr9qNeiq8jbhE5pVMXOd5Ah3d/VBOEwY0iJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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