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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9846caa8a883db706d618ca0b98c5db68d182a0eff32d80cf3ae0c60e543764f' 
  AND token = 'lEgJWabRtGgzWbRVsDH5mfyMsCuN0jf3ZXOUWXms6PM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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