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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33e9439adf7490f239103d764749c2a166f042fb0fe352769a2819ff647f0d43' 
  AND token = 'vfygc7IdkjeZyxl8RQnmDa3cfuJxS/mJaC5IWCXePX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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