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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd098f25262506ed919c4664f0fa95e390142316fb173178475b27c689f9bbbd' 
  AND token = 'wS7HQxEe2oq+mVdt8+zjtEsyYhXpmMpFEE/0f7MpUEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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