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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7d860fa796145ef739cd2bc9849c1ea328f9da0f46a9c947a3a9f19359d5649' 
  AND token = 'l/amByqV0ra0gwC6/ii15PVavXokyqx3uv6hoZY9ArM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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